bitbake: bitbake: Set process names to be meaninful

This means that when you view the process tree, the processes
have meaningful names, aiding debugging:

$ pstree -p 30021
bash(30021)───KnottyUI(115579)───Cooker(115590)─┬─PRServ(115592)───{PRServ Handler}(115593)
                                                ├─Worker(115630)───bash:sleep(115631)───run.do_sleep.11(115633)───sleep(115634)
                                                └─{ProcessEQueue}(115591)

$ pstree -p 30021
bash(30021)───KnottyUI(117319)───Cooker(117330)─┬─Cooker(117335)
                                                ├─PRServ(117332)───{PRServ Handler}(117333)
                                                ├─Parser-1:2(117336)
                                                └─{ProcessEQueue}(117331)

Applies to parse threads, PR Server, cooker, the workers and execution
threads, working within the 16 character limit as best we can.

Needed to tweak the bitbake-worker magic values to tell the
workers apart.

(Bitbake rev: 539726a3b2202249a3f148d99e08909cb61902a5)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/ui/knotty.py

@@ -272,6 +272,8 @@ def main(server, eventHandler, params, tf = TerminalFilter):
     logger.addHandler(console)
     logger.addHandler(errconsole)
 
+    bb.utils.set_process_name("KnottyUI")
+
     if params.options.remote_server and params.options.kill_server:
         server.terminateServer()
         return

bitbake/lib/bb/ui/uievent.py

@@ -104,6 +104,7 @@ class BBUIEventQueue:
     def startCallbackHandler(self):
 
         self.server.timeout = 1
+        bb.utils.set_process_name("UIEventQueue")
         while not self.server.quit:
             try:
                 self.server.handle_request()